Question

Which would balance the equation? (Look at picture on my laptop)

-3
-4
-1
-2

Answer 1

The answer is 2

2H2 + O2 ---> 2H2O

Answer 2

Answer: 2

Balanced chemical equation:

2 H2 + O2 -> 2H2O

Left side:

4 H’s (2 x 2)
2 O’s (1 x 2)

Right side:

4 H’s (2 x 2)
2 O’s (2 x 1)

Therefore, left side equals to the right side.